How Can I Resolve a Dual Employment Issue from Joining and Exiting on the Same Day?

Hi, I left my first company on 18 April and joined the second company on the same day. Now, after one year, as I am switching to the third company, I have encountered an issue of dual employment on 18 April. I was completely unaware of this dual employment situation, and I attended a meeting at night in the second company after handing over all resources to my first company.

Impact of Dual Employment on Career

How much can this situation affect my career, and how can I resolve this issue to move forward smoothly?

Technically, this is a case of double employment, so you need to explain the facts to any prospective employer. Do you have any evidence (like mail, WhatsApp invitation, or minutes, etc.)? Support your story with that.